Burn the midnight oil
To stay up late working or studying.

Full of beans
Energetic and enthusiastic.

Run out of steam
To lose energy or enthusiasm.

Hit the ground running
To start a new activity with a lot of energy and enthusiasm.

Recharge one's batteries
To rest and regain energy.

Full of life
Vibrant and energetic.

Keep the ball rolling
To maintain the momentum of an activity.

A shot in the arm
Something that boosts energy or enthusiasm.

Give it your all
To put all your energy and effort into something.

Burn out
To become exhausted or lose motivation.

Wired
Full of energy or excited.

In high spirits
Feeling very happy and energetic.

Go the extra mile
To make a special effort beyond what is expected.

Pick up the pace
To increase speed or energy in doing something.

Light a fire under someone
To motivate someone to take action.

Jumpstart
To revive or energize something.

Throw in the towel
To give up due to lack of energy or resources.

On the go
Always busy and active.

In full swing
At the height of activity or energy.

High energy
Very energetic or enthusiastic.